100 => 100
101 => 101
1013 => 1013
1014 => 1014
1015 => 1015
1053 => 1053
1057 => 1057
1059 => 1059
1065 => 1065
119 => 119
1198 => 1198
1227 => 1227
1228 => 1228
1229 => 1229
1230 => 1230
1231 => 1231
1232 => 1232
1233 => 1233
1234 => 1234
1238 => 1238
1239 => 1239
1241 => 1241
1298 => 1298
1299 => 1299
1300 => 1300
1311 => 1311
1317 => 1317
1318 => 1318
1320 => 1320
1321 => 1321
1322 => 1322
1323 => 1323
1324 => 1324
1325 => 1325
1327 => 1327
1328 => 1328
1329 => 1329
1347 => 1347
1348 => 1348
1349 => 1349
1350 => 1350
1351 => 1351
1352 => 1352
1374 => 1374
1375 => 1375
1376 => 1376
1377 => 1377
1390 => 1390
1393 => 1393
1394 => 1394
1395 => 1395
1396 => 1396
1397 => 1397
1398 => 1398
...

##</code><code>##

return @parents ? [ map {
                         map { "$_/$folderid" } @{ build_path( $_ ) }
                        } @parents ]
                : [ $folderid ];

##</code><code>##

#!/usr/bin/perl -w
use strict;

my $foldername_file = shift @ARGV;
my $folderfolder_file = shift @ARGV;
my %folders = ();
my %folderpaths = ();

open(FNAMES,"$foldername_file") or die "Can't open $foldername_file: $!\n";
foreach my $folderline (<FNAMES>) {
        chomp $folderline;
        if ($folderline =~ /^Folder (\d{3,5})\s+\-\s+(.*)\.$/) {
                $folders{$1} = $2;
        }
}
close(FNAMES);

open(FFINFO,"$folderfolder_file") or die "Can't open $folderfolder_file: $!\n";
my @subfolders = <FFINFO>;

my %parents_of;
my $parentid;

while ( my $line = <FFINFO> ) {
    if ($line =~ /^Folder (\d{3,5})\s+\-\s+.*\./) {
        $parentid = $1;
    }
    elsif ($line =~ /\s+subfolder\s+(\S+)\s+\-\s+.*\./) {
        push @{ $parents_of{ $1 } }, $parentid;
    }
}

sub build_path {
    my $folderid = shift @_;
    my @parents = @{ $parents_of{ $folderid } || [] };
    return @parents ? [ map {
                                map { "$_/$folderid" } @{ build_path( $_ ) }
                            } @parents ]
                    : [ $folderid ];
}

foreach my $k (sort (keys (%folders))) {
    $folderpaths{$k} = build_path($k);
    print "$k => $_\n" for @{ $folderpaths{$k} };
}